Definition of ménage à trois noun from the Oxford Advanced Learner's Dictionary

 

ménage à trois

 noun
noun
BrE BrE//ˌmeɪnɑːʒ ɑː ˈtrwʌ//
 
; NAmE NAmE//ˌmeɪnɑːʒ ɑː ˈtrwʌ//
 
(pl. ménages à trois
BrE BrE//ˌmeɪnɑːʒ ɑː ˈtrwʌ//
 
; NAmE NAmE//ˌmeɪnɑːʒ ɑː ˈtrwʌ//
 
)
[usually singular](from French)
 
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a situation where three people, especially a husband, wife and lover, live together and have sexual relationships with each other